Well, I can't say I like this product the smell is very green like alfalfa yuck. My hair felt dirty after I rinsed it out plus it had a slight greenish hue to it. If you have every used this color you will know what I mean.
The process time was ridiculous over an hour and still the grey was not quite the color I would have liked. In addition to all of this it was very messy.

Unfortunately, this did not work at all for me. I followed the instructions, but the texture of the mix was too grainy to even stay applied to the hair. I had more on the floor than in my hair at the end. I tried one more time, adding oil in the mix to make less grainy. Unortunately, to no success. As for the color, it did not stain my hair at all.